tsconfig.json

{
    "compilerOptions": {
        /* Visit https://aka.ms/tsconfig to read more about this file */

        /* Language and Environment */
        "target": "es2016" /* Set the JavaScript language version for emitted JavaScript and include compatible library declarations. */,

        /* Modules */
        "module": "ES2015" /* Specify what module code is generated. */,
        "rootDir": "./src" /* Specify the root folder within your source files. */,

        /* Interop Constraints */
        "esModuleInterop": true /* Emit additional JavaScript to ease support for importing CommonJS modules. This enables 'allowSyntheticDefaultImports' for type compatibility. */,
        "forceConsistentCasingInFileNames": true /* Ensure that casing is correct in imports. */,

        /* Type Checking */
        "strict": true /* Enable all strict type-checking options. */,
        "noImplicitAny": true /* Enable error reporting for expressions and declarations with an implied 'any' type. */,
        "strictNullChecks": true /* When type checking, take into account 'null' and 'undefined'. */,

        /* Completeness */
        "skipLibCheck": true /* Skip type checking all .d.ts files. */
    }
}